INDEX 



373 



mitochondria, 41, 125, 127 



mitome, 34 



mitosis, 44, ff.; causes of, 76, ff.; 

 diagram, 48; duration, 54; in 

 Protozoa, 57, ff.; in Salamandra, 

 46-47; in Unio, 60; mechanism 

 of, 79, ff.; modifications, 57, ff.; 

 of cleavage, 219 



Moenkhaus, 75, 223 



monads, 138 



Monas, anisogamy, 198 



monocentric system, 79 



monodermic organism, 330 



moncestrous, 103 



monogony, 12 



monosome, 310 



monospermy, 169 



Montgomery, 68, 101, 135, 311 



Moore, 135 



.Morgan, 269, 275, 276, 277, 301, 

 311, 313 



Morgan and Spooner, 275 



morphogenetic processes, 359, ff. 



Morse, 205 



mouse, amitosis in tendon cells, 43 



multiple embryo formation, 315 



multiplication, period of, during 06- 

 and spermatogenesis, 113, 114 



Mus; see mouse, rat. 



Musca, ovum, 91 



Myzostoma, spermatozoon, 99 



Nageli, 265 



"Nebenkern,"41 



neck, of spermatozoon, 98 



Nereis, development after subjec- 

 tion to pressure. 281-282; en- 

 trance of spermatozoon, 168, 169; 

 fertilization, 174; oocyte, 89; 

 ovum, 95 



nests, formation of, 104 



neuroplasm, 267 



Newman and Patterson, 315 



Nezara, idiochromosomes, 313 



Noctiluca, conjugation, 192; nuclear 

 division, 61 



notochord, 336 



notogenesis, 333 



Noturus, blastula, 220, 331 



nuclear analysis, hypothesis of, 265, 

 288, ff. 



nuclear determination, 288 



nuclear sap, 37; as a factor in deter- 

 mination, 298 



nuclear substance, synthesis in cleav- 

 age, 220 



nuclein, synthesis in fertilization, 

 205-206 



nucleo-cytoplasmic relation, 77, 78 ; 

 in senescence and rejuvenation, 210 



nucleolus, 38 

 nucleus, structure, 37-38 

 nuptial season, 103 

 nurse cells, 118, 119 

 nutritive membranes, 97 

 nutritive relations of growing ova, 

 118, ff. 



Octets, of blastomeres, 229 



oestrus, 103 



oocytes, primary and secondary, 



114, 115, 144 



oogenesis, 18, 113, ff.', diagram, 114 

 oogonia, 114 

 oogonidia, 10 

 Opalina, chromosomes (amoeboid), 



54; conjugation, 193; nuclear 



division, 62 



Ophryotrocha, nurse cells, 119 

 Orcheobius, gametes, 198 

 organ-forming substances, 92, 267, 



organization, of germ, 23, 25; of 

 nucleus, 288, ff. ; of ovum, 91; 



during fertilization, 



179; relation to cleav- 

 age, 246 



Orthoptera, idiochromosomee, 312 



ovary, 109 



Overton, 136 



oviparous, 104 



ovum (or ova), amoeboid, 87, 88; 

 animal pole, 92; comparison with 

 spermatozoon, 101,. 150, 151;cyto- 

 plasmic differentiation, 90, ff.; 

 demersal, 104; deutoplasm in, 93; 

 follicle, 96, 119; human, 88; mem- 

 branes, 95, ff.; nucleus, 89; 

 numbers, 107, ff.; nutritive rela- 

 tions during growth, 118, ff.; 

 organization, 91, 266, ff.; pelagic, 

 104; polarity, 91, ff.; position with 

 reference to gravity, 95; promor- 

 phology, 91; reorganization fol- 

 lowing fertilization, 177; sizes, 87; 

 types, 87, ff.; vegetal pole, 92 



Pachynema, 135 



palingenetic traits, 27 



Palolo, spawning period, 103 



Paludina, spermatozoon, 99 



Pander, 355 



Pandorina, conjugation, 196; repro- 

 duction, 8-9, 9, 199, 200 



paralinin, 37 



Paramcecium, chromosomes, 59, 64, 

 296; - - number, 66; fertiliza- 

 tion (conjugation), 194, 195; 

 life cycle, 210, 211; maturation, 

 167 ' 



